pi@pi_horizon_emb:~ $ fdisk -lu /media/pi/41AB-0764/2016-03-18-raspbian-jessie-lite.img Disk /media/pi/41AB-0764/2016-03-18-raspbian-jessie-lite.img: 1.3 GiB, 1361051648 bytes, 2658304 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x6f92008e Device Boot Start End Sectors Size Id Type /media/pi/41AB-0764/2016-03-18-raspbian-jessie-lite.img1 8192 131071 122880 60M c W95 FAT32 (LBA) /media/pi/41AB-0764/2016-03-18-raspbian-jessie-lite.img2 131072 2658303 2527232 1.2G 83 Linux
Note the block size and start location of the partition you wish to mount.
Then mount the partition within the image to a location of your choice on your local disk. Note you need to specify the offset, which is the start location * the block size.
pi@pi_horizon_emb:/ $ sudo mount -t auto -o loop,offset=$((131072*512)) /media/pi/41AB-0764/2016-03-18-raspbian-jessie-lite.img ~/iso_mount/ pi@pi_horizon_emb:/ $ ls ~/iso_mount/ bin boot dev etc home lib lost+found media mnt opt proc root run sbin srv sys tmp usr var pi@pi_horizon_emb:/ $
You can then modify the contents of the image partition. Note the partition size is restricted (it won't just expand as you add to it):
pi@pi_horizon_emb:/ $ df /home/pi/iso_mount
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/loop0 1210960 732164 399232 65% /home/pi/iso_mount
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